Arc lamp



0t.=25, 1932. H. WAGENHOR/ST 1,884,417

ARC LAMP Filed Jan. :51, 1928 4 Sheets-Sheet 1 INVENTOR.

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3%. ATTORNEYS Oct. 25, 1932- J. H. WAGENHORST ARC LAMP Filed Jan. 31/ 1928 4 Sheets-Sheet 2 INVENTOR JHWayem/M/wz, By W W 14;; ATTORNEU 4 Sheets-Sheet a 'ARC LAMP Filed Jan. 31, 1928 J. H. WAGENHORST Oct. 25, 1932 25, 1932. J. H. WAGENHORST 84,417

ARC LAMP Filed Jan. 31. 1928 4 Sheets-Sheet 4 INVENTOR.

' J/EWa 627M154 ATTORNEYS simple and eflicient operatin Patented Oct. 1932 PATENT OFFICE JAHES H. WAGENHORST, OF JACKSON, MICHIGAN ABOLAKP Application filed January 81, 19%. Serial No. 250,887.

This invention relates to improvements in arc lamps.

One of the objects of my invention is to provide an arc lamp having an improved clutch construction for controlling the movable electrodes, which clutch is sim 1e and cheap to manufacture and always wor s well, no matter at what an le the lamp may be tipped. A further object of my invention.

is to provide an arc lamp construction such that the arc is always formed at the front,

thus making the lamp more eflicient as a source of light. A further object of my invention is to provide an arc lamp having a mechanism, which can be manufactured c eaply and is especially effective in use. A further object of my invention is to provide an arc lamp with an improved frame arrangement for 20 supporting the operating mechanism of the lamp. Another object is to provide such a frame for supportin the operating mechanism, together with an improved mounting for the reflectors. A further object of my invention is to provide a simple but effective housing for the operating mechanism of the lamp.

Further objects, and objects relating to details and economies of construction and operation, will definitely appear from the detailed description to follow. In one instance, I accom lish the objects of my invention b the evices and means set forth in the fo owing specification. My invention 35 is clearly defined and pointed out in the appended claims. A structure constituting a referred embodiment of my invention is illustrated in the accompanying drawin s, forming a part of this specification, in whic 49 Figure 1 is a 'view in front elevation of a lam and stand em ying my invention;

Fig. 2 is a view of the lamp in side elevation;

Fig. 3 is an enlar d view of the lamp,

5 in front elevation, with the housing for the 3 "IO Fig. 5 is a horizontal, sectional view through the lower portion of the lamp, taken on the line 55 of Fig. 3;

Fig. 6 is a horizontal, sectional view, taken on line 66 of Fig. 3, and showing the operating mechanism of the lamp in top elevation;

Fig. 7 is a detail, sectional view, taken on the line 77 of Fig. 3, and showing the clutch for controlling the movable electrodes;

Fig. 8 is a detaihsectional view showing the connection between the upper end of the clutch operating rod and the lever;

Fig. 9 is a section taken on the line 99 of Fig. 3, and showing the guide for the clutch operating rod and its mounting on the carbon holder;

Fig. 10 is a wiring diagram showing the electrical connections between the electrodes, the resistance coils and the solenoid;

Fig. 11 is a view, in front elevation, of the panel on which one of the resistance units is mounted, showing the switch for varying the ammnt of resistance thrown into the circuit, an

Fig. 12 is a view of the same taken in top elevation.

In the drawings, the same reference numerals refer to the same parts throughout the several views, and the sectional views are taken looking in the direction of the arrows at the ends of the section line.

Referring to the drawings, in which I have illustrated one embodiment of my invention, I have shown the operating mechanism for the arc lamp carried upon an oblong frame consisting of a strap bent into general rectangular shape and providing the side members 10, the\top member 11, and the portions 12, constituting the base of the rectangle. The portions12 are bent. downwardly at 13, said portions 13 being spaced apart sufiiciently to permit the upper end of a standard to be inserted between them. These downward extensions are then brought together, as at 14, 'and fastened together by the bolts 14'. [The lower ends of these extensions are spaced apart, asat 15, the pottions 13', Hand 15 extending downwardly from the base 12 of the frame, thus constitut- 5 members of the frame, near the lower side thereof. These stop members comprise angular brackets, each having the upwardly extending part 16, which is separated from the side member of the frame by a sheet of insulation 17, and secured to the frame by the bolt. 18. Each stop member 19 has two openings 20 therein through which the movable carbons or electrodes, 21, may slide. Each stop member receives a pair of electrodes which work together, the electrodes of each pair being clamped between two clamping members forming a carbon holder. Each clamping member comprises the halfround portions 22, at each end thereof, which embrace carbons, and the central portion 23, which is brought into contact with the central portion of the other clamping member and secured thereto by means of a bolt 24,

on which a wing nut 25 is threaded. Thisbolt and wing nut also afl'ords means for connecting to said carbon holder, the circuit lead, as we shall presently point out. A guide 27 is fastened to each carbon holder by the bolt 24, and provided with a laterally bent upper end portion 28, having an opening therein through which a clutch operating rod 29 is guided. The guide 27 is insulated from the carbon holder by a sheet 26 of insulation. The lower end of the clutch operating rod is connected to a clutch operating on one carbon, of the pair clamped within said holder. Theclutch member comprises a strap, having a portion 31, bent to embrace one of said carbons, portions 32 disposed againstand contacting each other, and end portions 33 spaced from each other on opposite sides of the other carbon of the pair. The lower end of the clutch operating rod 29 is bent laterally, as at 34, and then extended at right angles, at 35, through holes in the end portions 33. V

The upper end of each clutch operating rod 29 is connected to the outer end of. one of the two levers 37. To make this connection, I- provide each clutch operating rod with an annular groove 38, near its upper end. The upper end of the rod is wrapped with a strip 39 of insulating material, over which is slipped the eye 40 of a cotter pin. The cotter pin is inserted through a hole 41 in the outer end of the corresponding lever 37 and the split ends '42 are then spread, which contracts the eye 40 soas-etoforce the insu-.

lating material 39 into the groove 38 and makes a very simple but effective connection between the end of the lever and the clutch operating rod 29.

The two levers 37 .are each pivoted, at 43, to

I the respective side members 10 of the frame.

The clutch operating rods 29 are connected ear-n17 to the outer ends of said levers, while the inner ends 'of the levers cross each other, as shown in Fig. 3. One lever lies on one side of the frame and the other on the opposite side thereof, but each lever is provided with an offset arm or flange 44, which embraces the corresponding side member 10 of the frame, as shown in Fig. 6, andthe pivot pin 43 extends through the side member of the frame, through the body of the lever and through the arm 44. The levers 37 are offset toward each other, as shown at 45, so that their inner ends, where they cross, are adjacent each other. A pin 46, carried by one of the levers, works in a slot 47, formed in the other lever.

A pair of V-shaped brackets 48 are fastened to one of the side members 10 and extend inwardly of the frame. A solenoid 49 is mounted between said V-shaped brackets and the brackets are drawn toward each other, to clamp the solenoidbetween them, by means of the bolts 50. The solenoid 49 has a laminated core 51 working therein, and the laminations of said core are divided and bent laterally in opposite directions, at 52. Springs 53 connect these laterally bent portions of the core to the inner ends of the levers 37.-

- In order to damp the movement of the levers a dashpot is provided. A bracket 54.

is secured to one side'member 10, near the lower end thereof.- -This bracket supports a dash pot 55, secured thereto by a screw 56. A plunger 57 works in this dash pot, and is connected to the inner end of one of the levers 37 by a rod 58, which extends'downwardly from said lever to the plunger.

Sheets 59 of insulating material are secured to the side members 10 of the frame, 13

and resistance coils 60 are mounted on them. These sheets 59 are preferably of asbestos board, which serves both as heat and electri-.

cal insulation, thus protecting the solenoid and the parts connected therewith from the heat generated in the resistance unit, and electrically insulating said resistance coils from the frame of the lamp. A wire 6l is connected to the left hand coil, as shown in F ig. 3, through a switch 64, and to the right hand carbon holder 22. Another lead 62 is 5 connected from one end of the solenoid 49 to the left hand carbon holder 22. The upper ends of the resistance coils 60 are connected by awire 90. y

In the construction of these are lamps it is a very desirable thing to have the arc, or the crater, formed at the ends of the electrodes This insures the formation of the arcs at thefront so that the full luminous effect of these arcs will be obtained.

On one of the insulating supports 59, I provide a pivoted switch arm 64, which is pivoted at 63, to which the lead 61 is connected. This switch arm is provided with an operating handle 65, and with a second arm 66, electrically connected with the arm 64, but extending on the other side of the support 59. Fixed contacts 67 and 68, respectively, are connected to the corresponding resistance coil 60 at different points therein. By swinging the switch arm 64 from an upper to a lower position, and vice versa, the lead 61 will be connected to the resistance coil 60 at different points in its length. In this way, it is possible to vary the amount of resistance included in the circuit with the solenoid and electrodes.

The lamp illustrated in this application comprises two pairs of movable electrodes cooperating with two pairs of fixed electrodes, in accordance with the invention set forth and claimed in my co-pending application for Letters Patent for arc lamps, Serial No. 92,201, filed March 4, 1926. I provide two reflectors 70, one surrounding each of the two sets of electrodes, each set comprising two movable and two stationary electrodes. These reflectors are positioned on opposite sides of the supporting arm formed by the portions 13, 14 and 15 extending downwardly from the base 12 of the frame. The upper surfaces of the two "reflectors engage the under side of the base portion 12 of the frame, and the adjacent side surfaces engage the downwardly extending arm. The reflectors are secured to the frame by means of bolts 71 passing through the corners of the reflectors and through the base portion of the frame, and are also secured to the supporting arm by means of the bolt 72,which passes through the side walls of the reflectors and through the portions 13 of the supporting arm. This bolt also affords a pivot by which the lamp is supported from a standard. A. strap 73, fastened to the inner surfaces of the bottom walls of said reflectors, extends through the side walls of the reflectors and is bent back upon itself, in the space between the reflectors, to form the upwardly projecting arm 74, which is received between the portions 15 of the frame supporting arm. It is clamped between these portions 15" by the clamps which support the stationary elec' trodes. i

The stationary electrodes 83 are supported, within the reflectors, by two clamping members, each having half-round portions 77,

which embrace the electrodes, flat portions 78, which engage each other and are clamped together by the bolts 79, and spring arms 80, extending from the adjacent half-round portions 77 toward the center of the clamping members. The central portions of the clamping members are bent to form the half-square portions 81, which embrace the portions 15 of the frame supporting arm and the portion 74 of the strap secured to the reflectors. A sheet 75 of insulating material is wrapped around the portions 15 and insulates them, and 'the part 74 of the strap, from the clamp ing members which are connected to the stationary electrodes. The spring arms of the clamping members are bolted together by means of the bolts 82.

The lamp is mounted upon a standard comprising a base having an upright tubular member 84, within which a standard is telescopically received. The standard 85 is held in adjusted relation with reference to the upright 84 by the clutch ring 86, surrounding the standard and having a lip engaging the upper end of the upright. I have not claimed this clutch ring construction in this application, since it forms the subjectmatter of my .copending application, Serial No. 250,868, filed of even'date herewith.

The upper end of the standard 85 is flattened, as at 87, and bent rearwardly. This end portion 87 is provided with a slot 88, which receives the pivot pin 72 carried by the supporting arm of the frame. The lamp is supported on the upper end of the standard by means of the engagement of the pivot pin in this slot, and this permits the lamp to be tilted so that the light therefrom may be directed at various angles.

Fig. 10 is a wiring diagram showing the electrical connections of this lamp. The lead 89, from a source of current, goes to the solenoid 49, from which the lead 62 leads to one of the pairs of movable electrodes, in

this instance, the right hand pair illustrated in Fig. 3. The current passes from these electrodes through the corresponding stationary electrodes 83, then through the lower electrode holder, comprising the clamping members 80, to the opposite pair of stationar electrodes 83, then through the corresponcing pair of movable electrodes 21, and through the lead 61, to the arm 64 of there-. sistance switch, "thence through the correspondingresistance coil 60', and through the connecting wire 90, to the other resistance coil, and, thence, throughthe lead 91 to the opstrap to the confi 'uration shown. The pro vision of a guide or the clutch operating rod also novel and particularly simple and eco-' ,noinical to manufacture.

The operating mechanism is enclosed within a housing comprising the end yvalls 92, each provided with a laterally extending flange 93, towhich' a side wall 94, of foraminous material, is connected, as shown in Fig. 1. The side walls 92 are provided with laterally extending flanges 95, which seat upon and are secured to the upper surfaces of the reflectors by the bolts 96. In this way, the cover for the operating mechanism is detachably connected to the upper surfaces of the reflectors. The foraminous side wall provides for the ventilation and cooling of the operating parts and this is an important feature.

I am aware that the construction illustrated and described in this specification may be varied considerably without departing from the spirit of my invention and, therefore, I claim my invention broadly as indicated in the appended claims.

What I claim is:

1. In an arc lamp, the combination of a pair of movable electrodes, means for clamping said electrodes in spaced and parallel arrangement, a stop member, 'a clutch adapted to engage said stop member and comprising a strap embracing one of said electrodes with the ends of said strap ex tending laterally on opposite sides of the other electrode, a clutch operating rod having its lower end bent laterally .and extended through the ends of said strap, a core for said solenoid and connections between said core and the clutch operating rod.

2. In an arc lamp, the combination of a pair of movable electrodes, a holder for clamping said electrodes in spaced and parallel arrangement, a clutch engaging-one of said electrodes, a clutch operating rod connectedto said clutch, a guide secured to said holder between said electrodes and having a guide opening through which said rod extends, a solenoid, a core fOl S21lCl solenoid and" connections between the clutch operating rod and said core.

3. In arc lamp, the combination of a pair of movable electrodes, a holder for clamping said electrodes in spaced and parallel arrangement, a clutch engaging one of said electrodes, a clutch operating rod connected to said clutch, a guide secured to said holder between said electrodes and extending upwardly therefrom, the upper end of said guide being bent laterallyand provided with a guide opening through which said rod. h

Lesa-n17 extends, a solenoid, a core for said solenoid and connections between the clutch operating rod and said core.

. 4. In an arc lamp,'the combination of a pair of upper electrodes, clutches engaging said electrodes, clutch operating rods, one connected to each clutch, a frame, a pair of levers pivoted on said frame with their inner arms crossing, a'pin on one of said arms working in a slot in the other, a solenoid, a core for said solenoid having a pair of lateral extensions, one underlyingeach of said arms, and a pair of springs connecting said core extensions and the inner ends of said arms, respectively.

5. In an arc lamp, the combination of a rectangular frame, stop members secured to the sides of said frame and extending outwardly therefrom, electrodes slidable through said stop members, a pair of levers pivoted to the sides of the frame, clutches engaging said electrodes, clutch operating rods connected to said clutches and the outer ends of said levers, a pair of V-shaped brackets fastened to a side member of the frame and extending inwardly thereof, a solenoid clamped between said brackets, a core for said solenoid and connections from said core to the inner ends'of said levers.

6. In an arc lamp, the combination of a rectangular frame, stop members secured to the sides of said frame and extending outwardly therefrom, electrodes slidable through said stop members, a pair of levers pivoted to the sides of the frame, clutches engaglng said electrodes, clutch operating rods connected to said clutches and to the outer ends of said levers, a solenoid supported by said frame and positioned within it, a core for said solenoid, connections from said core to the inner ends of said levers, the base of said frame being extended downwardly to form a supporting arm, a pivot pin carried by said arm and a supporting standard having a notch at its upper end receiving said pin.

7. In an arc lamp, an elongate vertical frame consisting of astrap of sheet metal bent into inverted U form and having inwardly extending portions constituting the base of said frame and downward extensions on said inwardly extending portions, a stationary electrode on each side of the downward extensions and supported thereby, movable electrodes associated with said stationary electrodes, electrode operating ,mechanism supported upon the inverted U portion of the frame and a reflector disposed about each associated set of electrodes, each of said reflectors having a top portion extending along and outwardly beyond one of said inwardly extending frame portions and a side portion extending along one of said downward extensions and carried thereby.

trodes two of which are jointly movable, a

electrodes which extends laterally therefrom and is provided with an aperture through which said clutch operating rod extends in electrode guiding relation.

* 9. In an arc lamp, the combination of movable electrodes, clutches engaging said electrodes, clutch operating rods connected to said clutches, a frame, a pair of levers pivoted on said frame, the outer ends of said levers being connected to 'the upper ends of. said rods, a solenoid, a laminated core for said solenoid, the laminations of said core being divided and bent laterally, means connecting the inner end of one lever with one of the laterally bent portions of the solenoid core, and a second means independent of the first connecting the inner end of the other lever with the other laterally bent portion of the solenoid core.

10. In an arc lamp, the combination of movable electrodes, clutches engaging said electrodes, clutch operating rods connected to said clutches, a frame, a pair of levers pivoted on said frame, the outer ends of said levers being connected to the upper ends of said rods, a solenoid, a laminated core for said solenoid, the laminations of said core being divided and bent laterally, a spring connecting the inner end of one lever with one of the laterally bent portions of the solenoid core, and a second spring independently connecting the inner end of the other lever with the other laterally bent portion of the solenoid core.

11., In an arc lamp, 9. pair of alined vertically disposed electrodes, the upper of which is movable toward and away from the lower to define the are, and mechanism for controlling the spacing of said electrodes comprising a tiltable clutch member engaged about said movable electrode, a solenoid winding in series with the arc circuit, a solenoid core con-,

trolled by said winding, means coupling said solenoid core to one side of said clutch memher to effect tilting thereof, engagement with and lifting of said movable electrode, and stop means stationary with respect to said clutch with an electrode encircling annulus of but slightly greater diameter than the movable electrode disposed therein and having its leg portions a-pertured adjacent their ends to constitute bearings for receiving said corecoupling means.

12. In an arc lamp, a pair of alined vertically disposed electrodes, the upper of which is movable toward and away from the lower to define the are, a solenoid, a core element associated with said solenoid, a clutch membcr engageable upon said movable electrode intermediate its ends, a vertical clutch operating rod coupling said clutch member and solenoid core and vertically movable by the latter to actuate said clutch and adjust said movable electrode with respect to said lower electrode, and means cooperating with said clutch member to maintain vertical alinement of said movable electrode with said lower electrode, said means comprising a clamp secured upon said movable electrode at its upper end and an upwardly and laterally extending strap-like member on said clamp which is provided with an aperture through which said vertically movable clutch operating rod extends in electrode guiding relation at a point above the upper end of said movable electrode.

member against which said clutch member comes to rest when lowered by said solenoid core to release and feed the-electrode, said clutch member comprising an elongate U- shaped strap of sheet metal constricted. ad-

jacent its bight portion toconstitute there- 

